高温气冷堆氦净化及氦辅助系统丝网气水分离器分离效率理论分析

氦净化及氦辅助系统是确保高温气冷堆安全运行的重要系统之一。该系统中，丝网气水分离器用于分离含氚废水及事故后除湿，是关键设备之一。本文基于理想流体流动模型和Carpenter的网垫级模型，建立丝网气水分离器分离效率计算模型，在此基础上编制了SEP-WMME计算程序，计算结果与实验结果吻合较好。利用SEP-WMME程序对球床模块式高温气冷堆（HTR-PM）氦净化系统工程验证试验回路中氦净化再生系统丝网气水分离器进行理论分析，结果表明：对于氦净化再生系统的丝网气水分离器，进气速度是一重要物理量，当进气速度达到3.0 m/s以上时，能获得较高的分离效率；丝网层数对分离效率有显著影响，但丝网层数达到一定程度后，效率提高不明显，需同时考虑压力损失，选择合适的层数；丝径也是影响分离效率的重要参数，丝径越小，分离效率越高。本文结果对氦净化及氦辅助系统中丝网气水分离器的结构设计、优化、安全运行具有重要作用。

Theoretic Analysis on Separation Efficiency of Wire Mesh Mist Eliminator of High-Temperature Gas-Cooled Reactor Helium Purification and Auxiliary

Helium purification and helium auxiliary system is one of important systems guaranteeing the safe operation of high-temperature gas-cooled reactor. Wire mesh mist eliminator in this system is one of the key components. It is used to separate waste water containing tritium, and remove moisture after reactor accident. Base on the ideal fluid model and packing pad model developed by Carpenter, a calculation model was presented for separation efficiency of mist eliminator. The calculation program SEP-WMME was developed based on the model. The calculation results fit well with experiment results. Theoretic analysis was carried out for the mist eliminator of regeneration system in HTR-PM helium purification system engineering validation test loop. The analysis results show that the inlet velocity is an important parameter for mist eliminator in regeneration system. When the inlet velocity is above 3.0 m/s, high separation efficiency will be obtained. The number of wire mesh layers also affects the separation efficiency remarkably. When the number of layers increases further to some extent, the separation efficiency increase becomes insignificant. The number of layers should be chosen properly by considering pressure loss. Additionally, the diameter of wire is an important parameter related to separation efficiency. The separation efficiency increases with the decrease of the wire diameter. The analysis is significant for structure design, optimization and safe operation of mist eliminator in helium purification and helium auxiliary system.